Crossword Genius

Old Boy, by himself, note, unfashionable (8)

Ross

I believe the answer is:

obsolete

'unfashionable' is the definition.
(obsolete means out of date)

'old boy by himself note' is the wordplay.
'old boy' becomes 'OB' (abbreviation for a private school 'old boy').
'by himself' becomes 'sole' (on one's own).
'note' becomes 'te' (musical note).
'ob'+'sole'+'te'='OBSOLETE'

(Other definitions for obsolete that I've seen before include "Gone out of use and no longer effective" , "No longer useful" , "Out-of-date" , "Disused" , "Outdated" .)

I've seen this clue in The Times.
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